Greigite

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The iron sulphide, greigite (Fe3S4), which was previously thought to be a rare magnetic mineral, commonly occurs in anoxic marine and lake sediments (Roberts and Weaver, 2005, and reference therein). Greigite, like magnetite, has an inverse spinel crystalline structure, but unlike magnetite, the fundamental magnetic parameters for greigite are still poorly constrained. Chang et al. (2008) recently published values for saturation magnetization and the exchange constant. Greigite decomposes during heating, which makes determination of its Curie temperature difficult. Chang et al. (2008) estimated Tc to be at least 350 °C.

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Physical Properties

Physical Parameter	Description C/Value	Units
Chemical formula		N/A
Density		kg.m-3
Unit cell		Å
Color		N/A
Crystal habit		N/A
Moh's hardness		N/A

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Magnetic Properties

Physical Parameter	Description /Value	Units
Magnetic ordering		N/A
Ms		kA.m-1
Tc or Tn		(°C)
K		J.m-3

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Common Occurrences

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References

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Further Reading

Can be removed if not needed.

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See Also

List of other relevant MagWiki pages.